Arbor construction



MMQAWBC,

N. ROACH.

ARBOR CONSTRUCTION.

FILED JUNE 19, 1920.

Jan. 2; 1928,

NATZEIAN 51 3, GE CLEVELAND, OHIO, ASSIGNOR TO THE CLEVELAND BRASS MANUTG COMPAIYY, OE CLEVELAND, OHIO, A CORPORATION OF OHIO.

ARBOR CGNSTE-UCTION.

application filed June 19,

To (all whom it may concern:

Be it known that T, NATHAN Ttoaon, a citizen of the United States,residing at Cleveland, in the county of Cuyahogaand State of Uhio, haveinvented a certain new and useful Improvement in Arbor Constructions, ofwhich the following is a full, clear, and exact description.

The present invention relates to a device wherein a spindle which servesas a centering spindle or support for an article upon which some work isto be done is associated with a driven member and clutch mechanism,whereby the spindle may be caused to turn and cease from turning atwill.

The device finds special utility as an attachment for a machine whereinobjects are intermittently and more or less rapidly inserted andremoved, having some Work performed on them while in the machine.

Frequently such operations require that an operator insert the articlein a machine, perform some short operation such as trimming, burnishingetc. and then remove the article. Under such conditions, speed ininserting and removing the articles, is of prime importance and thepresent invention is directed to facilitate the speeding up of suchoperations.

Reference should be had to the accompanying drawings forming a part ofthis specification in which Fig. 1 is an elevation of a portion of amachine having the device of the present invention incorporatedtherewith; Fig. 2 is a sectional. elevation of a portion of the device;Fig. 3 is a front elevation of a portion of the device.

Without in any way intending to limit the scope of applicability of theinvention, a description of the invention will be given as exemplifiedin its application to a lathe in which lathe articles are successivelypositioned, some operation performed on them and the article removed.

Referring to the drawing, 1 represents a bracket or support for the workdriving element 2, this element being free to turn in the bracket 1 andis driven in any desired manner. In connection with all such lathes itis usual to have some belt shifting mechanism or an equivalent mechanismby which the driving mechanism for the element 2 is caused to be on oroff. Such a mechanism is 1920. Serial No. 390,095.

not shown but it is so commonly known in this art that illustration ordescription does not need to be given.

The member 3 of the lathe is represented at 3 and is slidable along thebed of the lathe in the usual and well known fashion. This member isprovided with the usual and Well known tail stock spindle such asrepresented i- .vhich is turned inwardly or outwardly by means of thecrank construction 5.

The tool carriage is generally represented at 6 and while the toolbracket or post is not shown, it will be understood that the carriage 6is intended to support such a too-1 post.

It is usual practice for the element 2 to have a suitable opening suchas indicated in dotted lines at 7 in which a pointed arbor is insertedin alignment with the lathe center P carried by the sliding member a andwork which is placed in the machine to be operated on, is centered onthese arbors. In in.- serting and removing an article from the latheunder the usual conditions, it is necessary to stop rotation of theelement 2, insert the article by centering it between the arbors, againstart the machine and perform the operation on the article and inremoving the article, the machine must be stopped and the handleoperated until the article is released.

In the present invention there is provided an arbor such as indicated at10 which is adapted to fit into the opening or recess 7 in the element2. The arbor 10 has an enlarged portion 11 which has a recess 12 withsubstantially straight side walls and throughout a portion of its extenthas slanting side walls as indicated at 13, thus presenting in general acone effect. Extending rearwardly from the opening 12 is a recess 14which is adapted to receive a stub shaft 16 which stub shaft haspreferably, although not necessarily integrally formed therewith a head15, the side wall of which is complementary to the slant of the wall 13.Behind the head 15 is a spring 16 which bears against a ball thrustplate 17 and this in turn bears against a plate 18. the plates 17 and 18having openings therein through which the stub shaft 16 extends. Thespring 16 is such that the normal thrust of the spring is to push thehead 15 out of engagement with the walls 13.

Either formed integrally or separately formed and attachednto the headv15 is short shaft 19, the axis, of which is inallgnment with the stubshaft 16. This short shaft 19 has a head as indicated at 20, whichhead-is preferably formed with edges such as indicated at 21 in Fig. 3.In the figure referred to the head is shown as that of a truncatedpyramid. This is but suggestive and other forms of head may be used.

Secured to and supported upon the bed of This the la;,-tl-i.-. is van 1,upr-ight ,member 22. member has an opening through which the shortshaft 19 extends. The member 22 is fixedly supported, I

Atiired to the head 15 in any suitable manner is a friction disc. 23,this disc being carriedupon thehead 15 adjacent the upright member ;22.

WVhen the arbor 10 is inserted in the element 2 it hasa close drivingfit so that the arborwlO; and the enlargement 11 which is connettedtothearbor 10 will rotate when theihead is rotated. Under the normalact/lQIL'Of the spring 16 the head 15 is out of engagement with thewalls 13 of the member 11 and the friction disc 23 is in contact withthe upright memberv 22, hence any tend.- ency of thehead 15 torotate isobviated, although the arbor 1O andthe enlarged member 11 may berotating with the element 2.

It will also be clear that under the situation explained, the shortshaft 19 and the end member 23 as carried thereby are also arrested fromrotation.

lfunder the condition named, that is to say,,with the element 2rotating, an article Abe-positioned inthe lathe so that the portion,,20is contacting or engaging with the article/at one end thereof and thelathe center 4- is contacting with the other end thereof, then if thelathe center P be moved by turning the-crank 5, the head 15 will bemoved against the action of the spring 16, until the walls 13 areengaged whereupon the head 15- and the parts associated there- 1 withwill rotate, and consequently induce rotation of the article A.

During thisrotation such work as is desired is performed upon thearticle A and as soon as this is completed the crankfi is turned'in adirect-ion to move the lathe center 1"" outwardly, which operationrelieves the compression of the spring 16, forcing the head 15 out ofits clutching engagement and as the disc 23 engages with the uprightmember 22, rotation of the head 15 and the parts associated therewitharrested and article A stops rotating sothat it maybe removed from thelathe and vreplaced by another article,

It will. he seenv from the foregoing that successive articlesmay beplaced in the lathe and removed from the lathe without stopping rotationof the element 2, which results in a great saving of time and theconsequent ability to operate upon an increased number of articles overwhat would be the case if p the machine had to be started and stopped asdescribed.

Having described my invention, 1 claim- The combination with a headhaving recess formed therein, a clutch face forming a part of saidrecess, of an arbor, a member carried by said arbor and having a surfaceadapted to cooperate with said clutch face, the said arbor havingaportion extendingthrough the recess in the head and having a bearing inthe head, a thrust member located in the recess, a resilient memberextending between the thrust member and the member carried by the arborto normally hold the member on the arbor out of clutched position,friction material carried by the arbor and a stationary memberwith'which the said friction material is adapted to enwhen the member onthe arbor is in unclutched position.

In testimonywhereof, I hereuntoaifix my signature.

NATHAN ROAGH.-

